Cord tensioner



FIG. 1 is a perspective view of a cord tensioner according to the claimed design;

FIG. 2 is a front view of the cord tensioner of FIG. 1;

FIG. 3 is a rear view of the cord tensioner of FIG. 1;

FIG. 4 is a right side view of the cord tensioner of FIG. 1;

FIG. 5 is a left side view of the cord tensioner of FIG. 1;

FIG. 6 is a top view of the cord tensioner of FIG. 1; and,

FIG. 7 is a bottom view of the cord tensioner of FIG. 1.

The dash-dash broken lines illustrate environmental structure and form no part of the claimed design. 

CLAIM The ornamental design for a cord tensioner, as shown and described. 